Use cfg_if for unsupported fallback

Author: thaliaarchi

library/std/src/env.rs

@@ -950,7 +950,7 @@ impl fmt::Debug for ArgsOs {
 /// Constants associated with the current target
 #[stable(feature = "env", since = "1.0.0")]
 pub mod consts {
-    use crate::sys::env_consts::os;
+    use crate::sys::env_consts as os;
 
     /// A string describing the architecture of the CPU that is currently in use.
     /// An example value may be: `"x86"`, `"arm"` or `"riscv64"`.

library/std/src/sys/env_consts.rs

@@ -1,379 +1,289 @@
 //! Constants associated with each target.
 
-// Keep entries sorted alphabetically.
-
-#[cfg(target_os = "aix")]
-pub mod os {
-    pub const FAMILY: &str = "unix";
-    pub const OS: &str = "aix";
-    pub const DLL_PREFIX: &str = "lib";
-    pub const DLL_SUFFIX: &str = ".a";
-    pub const DLL_EXTENSION: &str = "a";
-    pub const EXE_SUFFIX: &str = "";
-    pub const EXE_EXTENSION: &str = "";
-}
-
-#[cfg(target_os = "android")]
-pub mod os {
-    pub const FAMILY: &str = "unix";
-    pub const OS: &str = "android";
-    pub const DLL_PREFIX: &str = "lib";
-    pub const DLL_SUFFIX: &str = ".so";
-    pub const DLL_EXTENSION: &str = "so";
-    pub const EXE_SUFFIX: &str = "";
-    pub const EXE_EXTENSION: &str = "";
-}
-
-#[cfg(target_os = "cygwin")]
-pub mod os {
-    pub const FAMILY: &str = "unix";
-    pub const OS: &str = "cygwin";
-    pub const DLL_PREFIX: &str = "";
-    pub const DLL_SUFFIX: &str = ".dll";
-    pub const DLL_EXTENSION: &str = "dll";
-    pub const EXE_SUFFIX: &str = ".exe";
-    pub const EXE_EXTENSION: &str = "exe";
-}
-
-#[cfg(target_os = "dragonfly")]
-pub mod os {
-    pub const FAMILY: &str = "unix";
-    pub const OS: &str = "dragonfly";
-    pub const DLL_PREFIX: &str = "lib";
-    pub const DLL_SUFFIX: &str = ".so";
-    pub const DLL_EXTENSION: &str = "so";
-    pub const EXE_SUFFIX: &str = "";
-    pub const EXE_EXTENSION: &str = "";
-}
-
-#[cfg(all(target_os = "emscripten", target_arch = "wasm32"))]
-pub mod os {
-    pub const FAMILY: &str = "unix";
-    pub const OS: &str = "emscripten";
-    pub const DLL_PREFIX: &str = "lib";
-    pub const DLL_SUFFIX: &str = ".so";
-    pub const DLL_EXTENSION: &str = "so";
-    pub const EXE_SUFFIX: &str = ".js";
-    pub const EXE_EXTENSION: &str = "js";
-}
-
-#[cfg(target_os = "espidf")]
-pub mod os {
-    pub const FAMILY: &str = "unix";
-    pub const OS: &str = "espidf";
-    pub const DLL_PREFIX: &str = "lib";
-    pub const DLL_SUFFIX: &str = ".so";
-    pub const DLL_EXTENSION: &str = "so";
-    pub const EXE_SUFFIX: &str = "";
-    pub const EXE_EXTENSION: &str = "";
-}
-
-#[cfg(target_os = "freebsd")]
-pub mod os {
-    pub const FAMILY: &str = "unix";
-    pub const OS: &str = "freebsd";
-    pub const DLL_PREFIX: &str = "lib";
-    pub const DLL_SUFFIX: &str = ".so";
-    pub const DLL_EXTENSION: &str = "so";
-    pub const EXE_SUFFIX: &str = "";
-    pub const EXE_EXTENSION: &str = "";
-}
-
-#[cfg(target_os = "fuchsia")]
-pub mod os {
-    pub const FAMILY: &str = "unix";
-    pub const OS: &str = "fuchsia";
-    pub const DLL_PREFIX: &str = "lib";
-    pub const DLL_SUFFIX: &str = ".so";
-    pub const DLL_EXTENSION: &str = "so";
-    pub const EXE_SUFFIX: &str = "";
-    pub const EXE_EXTENSION: &str = "";
-}
-
-#[cfg(target_os = "haiku")]
-pub mod os {
-    pub const FAMILY: &str = "unix";
-    pub const OS: &str = "haiku";
-    pub const DLL_PREFIX: &str = "lib";
-    pub const DLL_SUFFIX: &str = ".so";
-    pub const DLL_EXTENSION: &str = "so";
-    pub const EXE_SUFFIX: &str = "";
-    pub const EXE_EXTENSION: &str = "";
-}
-
-#[cfg(target_os = "hermit")]
-pub mod os {
-    pub const FAMILY: &str = "";
-    pub const OS: &str = "hermit";
-    pub const DLL_PREFIX: &str = "";
-    pub const DLL_SUFFIX: &str = "";
-    pub const DLL_EXTENSION: &str = "";
-    pub const EXE_SUFFIX: &str = "";
-    pub const EXE_EXTENSION: &str = "";
-}
-
-#[cfg(target_os = "horizon")]
-pub mod os {
-    pub const FAMILY: &str = "unix";
-    pub const OS: &str = "horizon";
-    pub const DLL_PREFIX: &str = "lib";
-    pub const DLL_SUFFIX: &str = ".so";
-    pub const DLL_EXTENSION: &str = "so";
-    pub const EXE_SUFFIX: &str = ".elf";
-    pub const EXE_EXTENSION: &str = "elf";
-}
-
-#[cfg(target_os = "hurd")]
-pub mod os {
-    pub const FAMILY: &str = "unix";
-    pub const OS: &str = "hurd";
-    pub const DLL_PREFIX: &str = "lib";
-    pub const DLL_SUFFIX: &str = ".so";
-    pub const DLL_EXTENSION: &str = "so";
-    pub const EXE_SUFFIX: &str = "";
-    pub const EXE_EXTENSION: &str = "";
-}
-
-#[cfg(target_os = "illumos")]
-pub mod os {
-    pub const FAMILY: &str = "unix";
-    pub const OS: &str = "illumos";
-    pub const DLL_PREFIX: &str = "lib";
-    pub const DLL_SUFFIX: &str = ".so";
-    pub const DLL_EXTENSION: &str = "so";
-    pub const EXE_SUFFIX: &str = "";
-    pub const EXE_EXTENSION: &str = "";
-}
-
-#[cfg(target_os = "ios")]
-pub mod os {
-    pub const FAMILY: &str = "unix";
-    pub const OS: &str = "ios";
-    pub const DLL_PREFIX: &str = "lib";
-    pub const DLL_SUFFIX: &str = ".dylib";
-    pub const DLL_EXTENSION: &str = "dylib";
-    pub const EXE_SUFFIX: &str = "";
-    pub const EXE_EXTENSION: &str = "";
-}
-
-#[cfg(target_os = "l4re")]
-pub mod os {
-    pub const FAMILY: &str = "unix";
-    pub const OS: &str = "l4re";
-    pub const DLL_PREFIX: &str = "lib";
-    pub const DLL_SUFFIX: &str = ".so";
-    pub const DLL_EXTENSION: &str = "so";
-    pub const EXE_SUFFIX: &str = "";
-    pub const EXE_EXTENSION: &str = "";
-}
-
-#[cfg(target_os = "linux")]
-pub mod os {
-    pub const FAMILY: &str = "unix";
-    pub const OS: &str = "linux";
-    pub const DLL_PREFIX: &str = "lib";
-    pub const DLL_SUFFIX: &str = ".so";
-    pub const DLL_EXTENSION: &str = "so";
-    pub const EXE_SUFFIX: &str = "";
-    pub const EXE_EXTENSION: &str = "";
-}
-
-#[cfg(target_os = "macos")]
-pub mod os {
-    pub const FAMILY: &str = "unix";
-    pub const OS: &str = "macos";
-    pub const DLL_PREFIX: &str = "lib";
-    pub const DLL_SUFFIX: &str = ".dylib";
-    pub const DLL_EXTENSION: &str = "dylib";
-    pub const EXE_SUFFIX: &str = "";
-    pub const EXE_EXTENSION: &str = "";
-}
-
-#[cfg(target_os = "netbsd")]
-pub mod os {
-    pub const FAMILY: &str = "unix";
-    pub const OS: &str = "netbsd";
-    pub const DLL_PREFIX: &str = "lib";
-    pub const DLL_SUFFIX: &str = ".so";
-    pub const DLL_EXTENSION: &str = "so";
-    pub const EXE_SUFFIX: &str = "";
-    pub const EXE_EXTENSION: &str = "";
-}
-
-#[cfg(target_os = "nto")]
-pub mod os {
-    pub const FAMILY: &str = "unix";
-    pub const OS: &str = "nto";
-    pub const DLL_PREFIX: &str = "lib";
-    pub const DLL_SUFFIX: &str = ".so";
-    pub const DLL_EXTENSION: &str = "so";
-    pub const EXE_SUFFIX: &str = "";
-    pub const EXE_EXTENSION: &str = "";
-}
-
-#[cfg(target_os = "nuttx")]
-pub mod os {
-    pub const FAMILY: &str = "unix";
-    pub const OS: &str = "nuttx";
-    pub const DLL_PREFIX: &str = "lib";
-    pub const DLL_SUFFIX: &str = ".so";
-    pub const DLL_EXTENSION: &str = "so";
-    pub const EXE_SUFFIX: &str = "";
-    pub const EXE_EXTENSION: &str = "";
-}
-
-#[cfg(target_os = "openbsd")]
-pub mod os {
-    pub const FAMILY: &str = "unix";
-    pub const OS: &str = "openbsd";
-    pub const DLL_PREFIX: &str = "lib";
-    pub const DLL_SUFFIX: &str = ".so";
-    pub const DLL_EXTENSION: &str = "so";
-    pub const EXE_SUFFIX: &str = "";
-    pub const EXE_EXTENSION: &str = "";
-}
-
-#[cfg(target_os = "redox")]
-pub mod os {
-    pub const FAMILY: &str = "unix";
-    pub const OS: &str = "redox";
-    pub const DLL_PREFIX: &str = "lib";
-    pub const DLL_SUFFIX: &str = ".so";
-    pub const DLL_EXTENSION: &str = "so";
-    pub const EXE_SUFFIX: &str = "";
-    pub const EXE_EXTENSION: &str = "";
-}
-
-#[cfg(target_os = "rtems")]
-pub mod os {
-    pub const FAMILY: &str = "unix";
-    pub const OS: &str = "rtems";
-    pub const DLL_PREFIX: &str = "lib";
-    pub const DLL_SUFFIX: &str = ".so";
-    pub const DLL_EXTENSION: &str = "so";
-    pub const EXE_SUFFIX: &str = "";
-    pub const EXE_EXTENSION: &str = "";
-}
-
-#[cfg(all(target_vendor = "fortanix", target_env = "sgx"))]
-pub mod os {
-    pub const FAMILY: &str = "";
-    pub const OS: &str = "";
-    pub const DLL_PREFIX: &str = "";
-    pub const DLL_SUFFIX: &str = ".sgxs";
-    pub const DLL_EXTENSION: &str = "sgxs";
-    pub const EXE_SUFFIX: &str = ".sgxs";
-    pub const EXE_EXTENSION: &str = "sgxs";
-}
-
-#[cfg(target_os = "solaris")]
-pub mod os {
-    pub const FAMILY: &str = "unix";
-    pub const OS: &str = "solaris";
-    pub const DLL_PREFIX: &str = "lib";
-    pub const DLL_SUFFIX: &str = ".so";
-    pub const DLL_EXTENSION: &str = "so";
-    pub const EXE_SUFFIX: &str = "";
-    pub const EXE_EXTENSION: &str = "";
-}
-
-#[cfg(target_os = "solid_asp3")]
-pub mod os {
-    pub const FAMILY: &str = "itron";
-    pub const OS: &str = "solid";
-    pub const DLL_PREFIX: &str = "";
-    pub const DLL_SUFFIX: &str = ".so";
-    pub const DLL_EXTENSION: &str = "so";
-    pub const EXE_SUFFIX: &str = "";
-    pub const EXE_EXTENSION: &str = "";
-}
-
-#[cfg(target_os = "tvos")]
-pub mod os {
-    pub const FAMILY: &str = "unix";
-    pub const OS: &str = "tvos";
-    pub const DLL_PREFIX: &str = "lib";
-    pub const DLL_SUFFIX: &str = ".dylib";
-    pub const DLL_EXTENSION: &str = "dylib";
-    pub const EXE_SUFFIX: &str = "";
-    pub const EXE_EXTENSION: &str = "";
-}
-
-#[cfg(target_os = "uefi")]
-pub mod os {
-    pub const FAMILY: &str = "";
-    pub const OS: &str = "uefi";
-    pub const DLL_PREFIX: &str = "";
-    pub const DLL_SUFFIX: &str = "";
-    pub const DLL_EXTENSION: &str = "";
-    pub const EXE_SUFFIX: &str = ".efi";
-    pub const EXE_EXTENSION: &str = "efi";
-}
-
-#[cfg(target_os = "visionos")]
-pub mod os {
-    pub const FAMILY: &str = "unix";
-    pub const OS: &str = "visionos";
-    pub const DLL_PREFIX: &str = "lib";
-    pub const DLL_SUFFIX: &str = ".dylib";
-    pub const DLL_EXTENSION: &str = "dylib";
-    pub const EXE_SUFFIX: &str = "";
-    pub const EXE_EXTENSION: &str = "";
-}
-
-#[cfg(target_os = "vita")]
-pub mod os {
-    pub const FAMILY: &str = "unix";
-    pub const OS: &str = "vita";
-    pub const DLL_PREFIX: &str = "lib";
-    pub const DLL_SUFFIX: &str = ".so";
-    pub const DLL_EXTENSION: &str = "so";
-    pub const EXE_SUFFIX: &str = ".elf";
-    pub const EXE_EXTENSION: &str = "elf";
-}
-
-#[cfg(target_os = "vxworks")]
-pub mod os {
-    pub const FAMILY: &str = "unix";
-    pub const OS: &str = "vxworks";
-    pub const DLL_PREFIX: &str = "lib";
-    pub const DLL_SUFFIX: &str = ".so";
-    pub const DLL_EXTENSION: &str = "so";
-    pub const EXE_SUFFIX: &str = "";
-    pub const EXE_EXTENSION: &str = "";
-}
-
-#[cfg(target_family = "wasm")]
-pub mod os {
-    pub const FAMILY: &str = "";
-    pub const OS: &str = "";
-    pub const DLL_PREFIX: &str = "";
-    pub const DLL_SUFFIX: &str = ".wasm";
-    pub const DLL_EXTENSION: &str = "wasm";
-    pub const EXE_SUFFIX: &str = ".wasm";
-    pub const EXE_EXTENSION: &str = "wasm";
-}
-
-#[cfg(target_os = "watchos")]
-pub mod os {
-    pub const FAMILY: &str = "unix";
-    pub const OS: &str = "watchos";
-    pub const DLL_PREFIX: &str = "lib";
-    pub const DLL_SUFFIX: &str = ".dylib";
-    pub const DLL_EXTENSION: &str = "dylib";
-    pub const EXE_SUFFIX: &str = "";
-    pub const EXE_EXTENSION: &str = "";
-}
-
-#[cfg(target_family = "windows")]
-pub mod os {
-    pub const FAMILY: &str = "windows";
-    pub const OS: &str = "windows";
-    pub const DLL_PREFIX: &str = "";
-    pub const DLL_SUFFIX: &str = ".dll";
-    pub const DLL_EXTENSION: &str = "dll";
-    pub const EXE_SUFFIX: &str = ".exe";
-    pub const EXE_EXTENSION: &str = "exe";
-}
-
-// Keep entries sorted alphabetically.
+// Keep entries sorted alphabetically, except when precedence matters.
+
+cfg_if::cfg_if! {
+    if #[cfg(target_os = "aix")] {
+        pub const FAMILY: &str = "unix";
+        pub const OS: &str = "aix";
+        pub const DLL_PREFIX: &str = "lib";
+        pub const DLL_SUFFIX: &str = ".a";
+        pub const DLL_EXTENSION: &str = "a";
+        pub const EXE_SUFFIX: &str = "";
+        pub const EXE_EXTENSION: &str = "";
+    } else if #[cfg(target_os = "android")] {
+        pub const FAMILY: &str = "unix";
+        pub const OS: &str = "android";
+        pub const DLL_PREFIX: &str = "lib";
+        pub const DLL_SUFFIX: &str = ".so";
+        pub const DLL_EXTENSION: &str = "so";
+        pub const EXE_SUFFIX: &str = "";
+        pub const EXE_EXTENSION: &str = "";
+    } else if #[cfg(target_os = "cygwin")] {
+        pub const FAMILY: &str = "unix";
+        pub const OS: &str = "cygwin";
+        pub const DLL_PREFIX: &str = "";
+        pub const DLL_SUFFIX: &str = ".dll";
+        pub const DLL_EXTENSION: &str = "dll";
+        pub const EXE_SUFFIX: &str = ".exe";
+        pub const EXE_EXTENSION: &str = "exe";
+    } else if #[cfg(target_os = "dragonfly")] {
+        pub const FAMILY: &str = "unix";
+        pub const OS: &str = "dragonfly";
+        pub const DLL_PREFIX: &str = "lib";
+        pub const DLL_SUFFIX: &str = ".so";
+        pub const DLL_EXTENSION: &str = "so";
+        pub const EXE_SUFFIX: &str = "";
+        pub const EXE_EXTENSION: &str = "";
+    } else if #[cfg(all(target_os = "emscripten", target_arch = "wasm32"))] {
+        pub const FAMILY: &str = "unix";
+        pub const OS: &str = "emscripten";
+        pub const DLL_PREFIX: &str = "lib";
+        pub const DLL_SUFFIX: &str = ".so";
+        pub const DLL_EXTENSION: &str = "so";
+        pub const EXE_SUFFIX: &str = ".js";
+        pub const EXE_EXTENSION: &str = "js";
+    } else if #[cfg(target_os = "espidf")] {
+        pub const FAMILY: &str = "unix";
+        pub const OS: &str = "espidf";
+        pub const DLL_PREFIX: &str = "lib";
+        pub const DLL_SUFFIX: &str = ".so";
+        pub const DLL_EXTENSION: &str = "so";
+        pub const EXE_SUFFIX: &str = "";
+        pub const EXE_EXTENSION: &str = "";
+    } else if #[cfg(target_os = "freebsd")] {
+        pub const FAMILY: &str = "unix";
+        pub const OS: &str = "freebsd";
+        pub const DLL_PREFIX: &str = "lib";
+        pub const DLL_SUFFIX: &str = ".so";
+        pub const DLL_EXTENSION: &str = "so";
+        pub const EXE_SUFFIX: &str = "";
+        pub const EXE_EXTENSION: &str = "";
+    } else if #[cfg(target_os = "fuchsia")] {
+        pub const FAMILY: &str = "unix";
+        pub const OS: &str = "fuchsia";
+        pub const DLL_PREFIX: &str = "lib";
+        pub const DLL_SUFFIX: &str = ".so";
+        pub const DLL_EXTENSION: &str = "so";
+        pub const EXE_SUFFIX: &str = "";
+        pub const EXE_EXTENSION: &str = "";
+    } else if #[cfg(target_os = "haiku")] {
+        pub const FAMILY: &str = "unix";
+        pub const OS: &str = "haiku";
+        pub const DLL_PREFIX: &str = "lib";
+        pub const DLL_SUFFIX: &str = ".so";
+        pub const DLL_EXTENSION: &str = "so";
+        pub const EXE_SUFFIX: &str = "";
+        pub const EXE_EXTENSION: &str = "";
+    } else if #[cfg(target_os = "hermit")] {
+        pub const FAMILY: &str = "";
+        pub const OS: &str = "hermit";
+        pub const DLL_PREFIX: &str = "";
+        pub const DLL_SUFFIX: &str = "";
+        pub const DLL_EXTENSION: &str = "";
+        pub const EXE_SUFFIX: &str = "";
+        pub const EXE_EXTENSION: &str = "";
+    } else if #[cfg(target_os = "horizon")] {
+        pub const FAMILY: &str = "unix";
+        pub const OS: &str = "horizon";
+        pub const DLL_PREFIX: &str = "lib";
+        pub const DLL_SUFFIX: &str = ".so";
+        pub const DLL_EXTENSION: &str = "so";
+        pub const EXE_SUFFIX: &str = ".elf";
+        pub const EXE_EXTENSION: &str = "elf";
+    } else if #[cfg(target_os = "hurd")] {
+        pub const FAMILY: &str = "unix";
+        pub const OS: &str = "hurd";
+        pub const DLL_PREFIX: &str = "lib";
+        pub const DLL_SUFFIX: &str = ".so";
+        pub const DLL_EXTENSION: &str = "so";
+        pub const EXE_SUFFIX: &str = "";
+        pub const EXE_EXTENSION: &str = "";
+    } else if #[cfg(target_os = "illumos")] {
+        pub const FAMILY: &str = "unix";
+        pub const OS: &str = "illumos";
+        pub const DLL_PREFIX: &str = "lib";
+        pub const DLL_SUFFIX: &str = ".so";
+        pub const DLL_EXTENSION: &str = "so";
+        pub const EXE_SUFFIX: &str = "";
+        pub const EXE_EXTENSION: &str = "";
+    } else if #[cfg(target_os = "ios")] {
+        pub const FAMILY: &str = "unix";
+        pub const OS: &str = "ios";
+        pub const DLL_PREFIX: &str = "lib";
+        pub const DLL_SUFFIX: &str = ".dylib";
+        pub const DLL_EXTENSION: &str = "dylib";
+        pub const EXE_SUFFIX: &str = "";
+        pub const EXE_EXTENSION: &str = "";
+    } else if #[cfg(target_os = "l4re")] {
+        pub const FAMILY: &str = "unix";
+        pub const OS: &str = "l4re";
+        pub const DLL_PREFIX: &str = "lib";
+        pub const DLL_SUFFIX: &str = ".so";
+        pub const DLL_EXTENSION: &str = "so";
+        pub const EXE_SUFFIX: &str = "";
+        pub const EXE_EXTENSION: &str = "";
+    } else if #[cfg(target_os = "linux")] {
+        pub const FAMILY: &str = "unix";
+        pub const OS: &str = "linux";
+        pub const DLL_PREFIX: &str = "lib";
+        pub const DLL_SUFFIX: &str = ".so";
+        pub const DLL_EXTENSION: &str = "so";
+        pub const EXE_SUFFIX: &str = "";
+        pub const EXE_EXTENSION: &str = "";
+    } else if #[cfg(target_os = "macos")] {
+        pub const FAMILY: &str = "unix";
+        pub const OS: &str = "macos";
+        pub const DLL_PREFIX: &str = "lib";
+        pub const DLL_SUFFIX: &str = ".dylib";
+        pub const DLL_EXTENSION: &str = "dylib";
+        pub const EXE_SUFFIX: &str = "";
+        pub const EXE_EXTENSION: &str = "";
+    } else if #[cfg(target_os = "netbsd")] {
+        pub const FAMILY: &str = "unix";
+        pub const OS: &str = "netbsd";
+        pub const DLL_PREFIX: &str = "lib";
+        pub const DLL_SUFFIX: &str = ".so";
+        pub const DLL_EXTENSION: &str = "so";
+        pub const EXE_SUFFIX: &str = "";
+        pub const EXE_EXTENSION: &str = "";
+    } else if #[cfg(target_os = "nto")] {
+        pub const FAMILY: &str = "unix";
+        pub const OS: &str = "nto";
+        pub const DLL_PREFIX: &str = "lib";
+        pub const DLL_SUFFIX: &str = ".so";
+        pub const DLL_EXTENSION: &str = "so";
+        pub const EXE_SUFFIX: &str = "";
+        pub const EXE_EXTENSION: &str = "";
+    } else if #[cfg(target_os = "nuttx")] {
+        pub const FAMILY: &str = "unix";
+        pub const OS: &str = "nuttx";
+        pub const DLL_PREFIX: &str = "lib";
+        pub const DLL_SUFFIX: &str = ".so";
+        pub const DLL_EXTENSION: &str = "so";
+        pub const EXE_SUFFIX: &str = "";
+        pub const EXE_EXTENSION: &str = "";
+    } else if #[cfg(target_os = "openbsd")] {
+        pub const FAMILY: &str = "unix";
+        pub const OS: &str = "openbsd";
+        pub const DLL_PREFIX: &str = "lib";
+        pub const DLL_SUFFIX: &str = ".so";
+        pub const DLL_EXTENSION: &str = "so";
+        pub const EXE_SUFFIX: &str = "";
+        pub const EXE_EXTENSION: &str = "";
+    } else if #[cfg(target_os = "redox")] {
+        pub const FAMILY: &str = "unix";
+        pub const OS: &str = "redox";
+        pub const DLL_PREFIX: &str = "lib";
+        pub const DLL_SUFFIX: &str = ".so";
+        pub const DLL_EXTENSION: &str = "so";
+        pub const EXE_SUFFIX: &str = "";
+        pub const EXE_EXTENSION: &str = "";
+    } else if #[cfg(target_os = "rtems")] {
+        pub const FAMILY: &str = "unix";
+        pub const OS: &str = "rtems";
+        pub const DLL_PREFIX: &str = "lib";
+        pub const DLL_SUFFIX: &str = ".so";
+        pub const DLL_EXTENSION: &str = "so";
+        pub const EXE_SUFFIX: &str = "";
+        pub const EXE_EXTENSION: &str = "";
+    } else if #[cfg(all(target_vendor = "fortanix", target_env = "sgx"))] {
+        pub const FAMILY: &str = "";
+        pub const OS: &str = "";
+        pub const DLL_PREFIX: &str = "";
+        pub const DLL_SUFFIX: &str = ".sgxs";
+        pub const DLL_EXTENSION: &str = "sgxs";
+        pub const EXE_SUFFIX: &str = ".sgxs";
+        pub const EXE_EXTENSION: &str = "sgxs";
+    } else if #[cfg(target_os = "solaris")] {
+        pub const FAMILY: &str = "unix";
+        pub const OS: &str = "solaris";
+        pub const DLL_PREFIX: &str = "lib";
+        pub const DLL_SUFFIX: &str = ".so";
+        pub const DLL_EXTENSION: &str = "so";
+        pub const EXE_SUFFIX: &str = "";
+        pub const EXE_EXTENSION: &str = "";
+    } else if #[cfg(target_os = "solid_asp3")] {
+        pub const FAMILY: &str = "itron";
+        pub const OS: &str = "solid";
+        pub const DLL_PREFIX: &str = "";
+        pub const DLL_SUFFIX: &str = ".so";
+        pub const DLL_EXTENSION: &str = "so";
+        pub const EXE_SUFFIX: &str = "";
+        pub const EXE_EXTENSION: &str = "";
+    } else if #[cfg(target_os = "tvos")] {
+        pub const FAMILY: &str = "unix";
+        pub const OS: &str = "tvos";
+        pub const DLL_PREFIX: &str = "lib";
+        pub const DLL_SUFFIX: &str = ".dylib";
+        pub const DLL_EXTENSION: &str = "dylib";
+        pub const EXE_SUFFIX: &str = "";
+        pub const EXE_EXTENSION: &str = "";
+    } else if #[cfg(target_os = "uefi")] {
+        pub const FAMILY: &str = "";
+        pub const OS: &str = "uefi";
+        pub const DLL_PREFIX: &str = "";
+        pub const DLL_SUFFIX: &str = "";
+        pub const DLL_EXTENSION: &str = "";
+        pub const EXE_SUFFIX: &str = ".efi";
+        pub const EXE_EXTENSION: &str = "efi";
+    } else if #[cfg(target_os = "visionos")] {
+        pub const FAMILY: &str = "unix";
+        pub const OS: &str = "visionos";
+        pub const DLL_PREFIX: &str = "lib";
+        pub const DLL_SUFFIX: &str = ".dylib";
+        pub const DLL_EXTENSION: &str = "dylib";
+        pub const EXE_SUFFIX: &str = "";
+        pub const EXE_EXTENSION: &str = "";
+    } else if #[cfg(target_os = "vita")] {
+        pub const FAMILY: &str = "unix";
+        pub const OS: &str = "vita";
+        pub const DLL_PREFIX: &str = "lib";
+        pub const DLL_SUFFIX: &str = ".so";
+        pub const DLL_EXTENSION: &str = "so";
+        pub const EXE_SUFFIX: &str = ".elf";
+        pub const EXE_EXTENSION: &str = "elf";
+    } else if #[cfg(target_os = "vxworks")] {
+        pub const FAMILY: &str = "unix";
+        pub const OS: &str = "vxworks";
+        pub const DLL_PREFIX: &str = "lib";
+        pub const DLL_SUFFIX: &str = ".so";
+        pub const DLL_EXTENSION: &str = "so";
+        pub const EXE_SUFFIX: &str = "";
+        pub const EXE_EXTENSION: &str = "";
+    } else if #[cfg(target_family = "wasm")] {
+        pub const FAMILY: &str = "";
+        pub const OS: &str = "";
+        pub const DLL_PREFIX: &str = "";
+        pub const DLL_SUFFIX: &str = ".wasm";
+        pub const DLL_EXTENSION: &str = "wasm";
+        pub const EXE_SUFFIX: &str = ".wasm";
+        pub const EXE_EXTENSION: &str = "wasm";
+    } else if #[cfg(target_os = "watchos")] {
+        pub const FAMILY: &str = "unix";
+        pub const OS: &str = "watchos";
+        pub const DLL_PREFIX: &str = "lib";
+        pub const DLL_SUFFIX: &str = ".dylib";
+        pub const DLL_EXTENSION: &str = "dylib";
+        pub const EXE_SUFFIX: &str = "";
+        pub const EXE_EXTENSION: &str = "";
+    } else if #[cfg(target_family = "windows")] {
+        pub const FAMILY: &str = "windows";
+        pub const OS: &str = "windows";
+        pub const DLL_PREFIX: &str = "";
+        pub const DLL_SUFFIX: &str = ".dll";
+        pub const DLL_EXTENSION: &str = "dll";
+        pub const EXE_SUFFIX: &str = ".exe";
+        pub const EXE_EXTENSION: &str = "exe";
+    } else {
+        pub const FAMILY: &str = "";
+        pub const OS: &str = "";
+        pub const DLL_PREFIX: &str = "";
+        pub const DLL_SUFFIX: &str = "";
+        pub const DLL_EXTENSION: &str = "";
+        pub const EXE_SUFFIX: &str = "";
+        pub const EXE_EXTENSION: &str = "";
+    }
+}
+
+// Keep entries sorted alphabetically, except when precedence matters.